02-28-2015
Check vmstat looking at PI column if actual swapping is occurring at a certain moment.
If not, you are fine at this moment (probably not due to free memory available on the machine from your post)
What should worry you that sometime in past swapping occurred and was used by a process(es) which is no longer running.
You might want to consider putting vmstat in cron to monitor your machine to pinpoint the time when swapping occurs, then identify what is being ran to cause such high memory usage.
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swapon(2) System Calls Manual swapon(2)
NAME
swapon - Adds a swap device for interleaved paging and swapping
SYNOPSIS
swapon( char *path, int flags, int lowat, int hiwat );
PARAMETERS
Specifies the block special device to be made available. Specifies a flag. Only the MS_PREFER flag is currently supported, and it causes
the specified path to be the preferred paging device. (Ignored on Tru64 UNIX.) Specifies the low water mark. (Ignored on Tru64 UNIX.)
Specifies the high water mark. (Ignored on Tru64 UNIX.)
DESCRIPTION
The swapon() function makes a block special device available to the system for allocation of paging and swapping space. (The operating
system does not currently support paging and swapping to a normal file. All swapping and pages areas must be block special devices.)
The calling process must have superuser privilege to call the swapon() function.
RETURN VALUES
Upon successful completion, the swapon() function returns a value of 0 (zero). If an error has occurred, -1 is returned and errno is set
to indicate the error.
ERRORS
If the swapon() function fails, errno may be set to one of the following values: A component of the path prefix is not a directory. The
pathname contains a character with the high-order bit set, the device was not specified, the device configured by the path parameter was
not configured into the system as a swap device, or the device does not allow paging. A component of a pathname exceeded NAME_MAX charac-
ters, or an entire pathname exceeded PATH_MAX characters. The named device does not exist. Search permission is denied for a component of
the path prefix. Too many symbolic links were encountered in translating the pathname. The caller does not have appropriate privilege.
The device specified by the path parameter has already been made available for swapping. The major device number of the path parameter is
out of range (this indicates no device driver exists for the associated hardware). An I/O error occurred while opening the swap device.
The path parameter points outside the process' allocated address space. An attempt was made to activate a paging file on a read-only file
system.
RELATED INFORMATION
Commands: swapon(8), config(8) delim off
swapon(2)